Rotary vacuum and compression pump



March 16, 1954 c v NQVAS 2,672,282

ROTARY VACUUM AND COMPRESSION PUMP Filed July 27, 1951 2 Sheets-Shet 1 Fla2- I f N VENTOR.

w iwmzzy March 16, 1954 c, v, NOVAS 2,672,282

ROTARY VACUUM AND COMPRESSION PUMP Filed July 27, 1951 2 Sheets-Sheet 2 [NVEN TOR.

ATTORNf-K Patented Mar. 16,. 1954 UNITED STATES PATENT OFFICE ROTARY VACUUM AND COMPRESSION PUMP Camilo Vazquez Novas, Havana, Cuba Application July 27, 1951, Serial No. 238,899

Claims. 1

This invention relates to a rotary vacuum and a pump of the type described in which the rotor 1 blades are made of a light weight material, such as a plastic material, whereby the pressure of said rotor blades against said cylindrical bore, due to the centrifugal force created by the rotation of the rotor, is greatly reduced.

Still another object of the invention is to provide a pump of the type described in which said cylindrical bore is closed by disc heads having annular recesses in their inner surfaces in which annular boxes are rotatably mounted, said annular boxes having annular channels in which sleeves are received which are rotatably mounted on the ends of said rotor blades, said annular boxes being mounted on anti-friction bearings in said recesses and provided with equidistantly spaced blocks in said channels of a circumferential length slightly greater than the circumference of said sleeves.

Other objects and advantages of the invention will be apparent from the following detailed description of an embodiment thereof with reference to the accompanying drawings in which:

Fig. 1 is an elevational side view of the pump,

Fig. 2 is a plan view of the same,

Fig. 3 is an enlarged longitudinal vertical sectional view of the pump on line 3-3 of Fig. 2,

Fig. 4 is an elevational end view of the pump with one of the disc heads thereof removed,

Fig. 5 is a cross-section of the pump on line 5-5 of Fig. 1,

Fig. 6 is a vertical sectional view similar to that of Fig. 5, the rotor having been removed,

Fig. '7 is a vertical sectional view similar to that of Fig. 6, the annular boxes and the ball bearings having been removed,

Fig. 8 is an enlarged sectional view on line 1-1 of Fig. 6 showing the structure of one of the annular boxes mounted within the heads of the pump barrel,

Fig. 9 is an elevational partly broken view of a detail of the ball bearing supporting the annular box,

Fig. 10 is a plan view of the ball ring, and

Fig. 11 is a perspective view of one of the rotor blades.

The rotary vacuum and compression pump of this invention is composed of a square-shaped barrel l secured to a supporting base 2 and having an inner hollow space 3 limited by an inner cylindrical surface 4, the hollow space 3 being closed at both ends of the barrel 1 by detachable disc heads 5 and 6 secured by screws 1 and 3 to the ends of the barrel I. The barrel I has formed at its top portion vertical conduits 9 and ill which lead from the outside into the inner space 3 of the barrel l thereby forming the air or gas suction and exhaust conduits. The inner surface 4 of the barrel I has formed therein recesses Ii and I2 of 45 circumferential length the conduits 9 and i0 communicating with one end of said recesses 12 and II respectively, which form air or gas suction and exhaust chambers.

The disc heads 5 and 6 have at their upper middle portion enlargements 5' and 6' with 0pposed cylindrical extensions 13 and I4 provided with bearing members I5 and I6 rotatably supporting a horizontal shaft 18 carrying a rotor 19, and the upper portions of the enlargements 5' and B have recesses 20 and 2| serving as lubricating oil cups closed by square-head screws 22 and 23, the recesses 20 and 2| being in communication with interior recesses I! in the bearing members I5 and I6 through inclined conduits 24 and 25 for the lubrication of the shaft [8.

The rotor l9 and its shaft [8 are eccentrically mounted with respect to the inner cylindrical surface 4 of the barrel l. The rotor l9 has a series of circumferentially spaced radial grooves 26, preferably four in number, which slidably receive a like number of blades formed by rectangular parallelepipedic blocks 21 preferably made of plastic material and provided, adjacent their inner edge, with longitudinally extending pins 28 projecting beyond the end faces of the blades and having loosely mounted on their projecting ends anti-friction metal sleeves 29 and 35 which fit loosely in annular channels 3| provided in annular boxes 32 of hardened or tempered steel. Said annular boxes 32 are loosely mounted in annular recesses 33 and 34 in the inner faces of the disc heads 5 and 6, respectively. said recesses 33 and 34 being coaxial with the cylindrical surface 4. Each of the annular boxes 32 is mounted on a ball bearing 35, the inner race of which is formed by hardened or tempered sleeves 36 also disposed in the annular recesses 33, 34 in the disc heads 5 and 6. The annular channels 3| in the annular boxes 32 are divided circumferentially into four sections by blocks 38 which are arranged with their center lines at angle from each other and secured by screws 39 to the annular boxes 32. The end surfaces of the blocks 38 coincide with diametrical planes through the annular channels 3|, and the length of each section of the annular channels 3| is equal to the outer circumference of one of the sleeves 29, 30 plus a s" when measured on a diameter through the center of said sleeves. Lubricant spaces 32 are provided between the annular boxes 32 and the bottom of the recesses 33 and 34, and said spaces are in communication with the recesses 20 and 2| in the disc heads.

It is found convenient that the distance between the outer periphery of the annular boxes 32 and the periphery of the rotor be not less than A" so as to prevent air from entering through the boxes.

As the rotor l9 rotates, the sleeves 29 or 30 successively engage one end of the blocks 38 and cause the respective annular box 32 to rotate on the ball bearing 35, the engagement of each sleeve continuing through a ,4; of a revolution of the rotor IS. The relative positions of the four sleeves 30 and the blocks 38 are indicated by dotted lines in Fig. 6. In this manner a tight seal between the blades 21 and the inner surface 4 of the barrel l is obtained.

While the blades 27 may be made of brass or iron, they should preferably be made of a hard plastic material because of its lighter weight; with heavier metal blades the centrifugal force created by the rotation of the rotor would cause excessive wear of the several movable parts.

It is obvious that changes may be made in the outer shape of the pump without any alteration of the inner mechanism thereof, and that the barrel may be made with one disc head integral therewith without thereby altering the essential character of the invention which is such as claimed hereinafter.

What I claim is:

1. A rotary vacuum and compression pump comprising a barrel having a substantially cylindrical bore therein in communication with circumferentially spaced inlet and outlet openings, disc heads defining end closures for said barrel, a rotor in said bore, a rotor shaft secured to said rotor concentrically therewith, bearing means for said rotor shaft in said disc heads, said bearing means being eccentrically disposed in relation to said cylindrical bore, an annular recess in the in terior surface of each of said disc heads, said recesses being concentric with said cylindrical bore, an annular box in each of said recesses in the disc heads, each of said boxes having an annular channel in the surface thereof facing said rotor and said boxes and channels bein concentric with said cylindrical bore, anti-friction bearings rotatably supporting said boxes in said recesses, radial grooves extending the length of said rotor, a rotor blade slidably mounted in each of said grooves in engagement with said cylindrical bore, a cylindrical sleeve of a diameter slightly less than the width of said channels at each end of said rotor blades, means rotatably supporting said sleeves on said rotor blades with each sleeve extending into one of said annularchannels, and

blocks secured in said channelsequidistantly from each other and equal in number with said rotor blades, the free space between every two of said blocks measured on a circle through the centers of said sleeves being slightly greater than the circumference of one of said sleeves, whereby rotation of said rotor causes'said sleeves at each end of'the rotor to successively engage said blocks in the corresponding channel and thereby to cause said annular boxes to rotate on saidantifriction bearings.

2. A rotary vacuum and compression pump as in claim 1, including lubricant reservoirs in said disc heads, lubricant spaces in said annular recesses, and conduit means in said disc heads connecting said lubricant reservoirs with said lubricant spaces.

3. A rotary vacuum and compression pump as in claim 1, in which said free space between every two of said blocks equals the circumference of one of said sleeves plus one thirty-second of an inch.

4. A rotary vacuum and compression pump as in claim 1, in which said rotor blades are made of plastic material, said means rotatably supporting said sleeves on said rotor blades comprising steel pins projecting into said sleeves from the ends of said blades.

5. A rotary vacuum and compression pump comprising a barrel having a substantially cylindrical bore therein in communication with circumferentially spaced inlet and outlet openings, disc heads defining end closures for said barrel, a rotor in said bore, a rotor shaft secured to said rotor concentrically therewith, bearing means for said rotor shaft in said disc heads, said bearing means being eccentrically disposed in relation to said cylindrical bore, an annular recess in the inner surface of each of said disc heads, said recesses being concentric with said cylindrical bore, lubricant reservoirs in said disc heads, lubricant spaces in said annular recesses, conduit means in said disc heads connecting said lubricant reservoirs with said lubricant spaces, an annular box in each of said recesses, each of said boxes having an annular channel in the surface thereof facing said rotor and said boxes and channels being concentric with said cylindrical bore, antifriction bearings in said recesses rotatably supporting said boxes, radial grooves in said rotor extending the length thereof, a rotor blade of plastic material slidably mounted in each of said radial grooves in engagement with said cylindrical bore, a cylindrical metal sleeve of a diameter slightly less than the width of said channel at each end of said rotor blades, metal pins secured to said blades and rotatably supporting said sleeves with each sleeve extending into one of said channels, and blocks secured in said channels equidistantly from each other and equal in number with said rotor blades, the free space between every two of said blocks measured on a circle through the centers of said sleeves being slightly greater than the circumference of one of said sleeves, whereby rotation of said rotor causes said sleeves at each end of the rotor to successively engage said blocks in the corresponding channel and thereby to cause said annular boxes to rotate on said anti-friction bearings.

CAMILO VAZQUEZ NOVAS.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 105,318 Dougherty July 12, 1870 465,907 Whipple Dec. 29, 1891 1,009,213 Augustine Nov. 21, 1911 1,199,229 Augustine Sept. 26, 1916 1,444,269 Piatt Feb. 6, 1923 1,488,729 Ballay Apr. 1, 1924 2,443,994 Scognamillo June 22, 1948 2,487,449 Knudsen Nov. 8, 1949 FOREIGN PATENTS Number Country Date 640,280 France Mar. 24, 1928 

